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On the differences between the two ‘indicator’ species of chaetognath, Sagitta setosa and S. elegans

Published online by Cambridge University Press:  11 May 2009

Q. Bone
Affiliation:
The Laboratory, Marine Biological Association, Citadel Hill, Plymouth PL1 2PB
C. Brownlee
Affiliation:
The Laboratory, Marine Biological Association, Citadel Hill, Plymouth PL1 2PB
G. W. Bryan
Affiliation:
The Laboratory, Marine Biological Association, Citadel Hill, Plymouth PL1 2PB
G. R. Burt
Affiliation:
The Laboratory, Marine Biological Association, Citadel Hill, Plymouth PL1 2PB
P. R. Dando
Affiliation:
The Laboratory, Marine Biological Association, Citadel Hill, Plymouth PL1 2PB
M. I. Liddicoat
Affiliation:
The Laboratory, Marine Biological Association, Citadel Hill, Plymouth PL1 2PB
A. L. Pulsford
Affiliation:
The Laboratory, Marine Biological Association, Citadel Hill, Plymouth PL1 2PB
K. P. Ryan
Affiliation:
The Laboratory, Marine Biological Association, Citadel Hill, Plymouth PL1 2PB

Extract

The suggestion that the two chaetognath species Sagitta setosa and S. elegans were ‘indicators’ of different water masses was first made by Meek (1928), working off Northumberland, and subsequently developed by Russell (1933, 1935, 1939) in his classical work on their distribution as indicators of ‘Channel’ and ‘Western’ water off Plymouth. The alternation in dominance of the two species during the well-known changes in the Western Channel off Plymouth during the past 60 years (which have been termed the ‘Russell’ cycle; Cushing & Dickson, 1976) have most recently been reviewed and discussed by Southward (1984).

Type
Research Article
Copyright
Copyright © Marine Biological Association of the United Kingdom 1987

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